实验4运算符重载参考答案

1、运算符重载1、实验目的和要求：掌握运算符重载的语法要点，学会运算符重载的编程方法。2、实验内容先读程序，写出程序的输出结果，再运行程序验证程序的输出。用友元重载方式重新编写程序。#includeusingnamespacestd;classVectorpublic:Vector(inti=0,intj=0)x=i;y=j;Vectoroperator+=(Vectorv)Vectortemp;temp.x=x+v.x;temp.y=y+v.y;returntemp;Vectoroperator-=(Vectorv)Vectortemp(x-v.x,y-v.y);returntemp;voidd

2、isplay()cout(x,y)endl;private:intx,y;voidmain()Vectorv1(1,2),v2(3,4),v3,v4;v3=v1+=v2;v4=v1-=v2;coutv1=;v1.display();/1，2coutv2=;v2.display();/3，4coutv3=;v3.display();/4，6coutv4=;v4.display();/-2，-2用友元方式实现：#includeusingnamespacestd;classVectorpublic:Vector(inti=0,intj=0)x=i;y=j;friendVectoroperator+=

3、(Vector&v1,Vector&v2)v1.x+=v2.x;v1.y+=v2.y;returnv1;friendVectoroperator-=(Vector&v1,Vector&v2)v1.x=v1.x-v2.x;v1.y=v1.y-v2.y;returnVector(v1.x,v1.y);voiddisplay()cout(x,y)endl;private:intx,y;voidmain()Vectorv1(1,2),v2(3,4),v3,v4;v3=v1+=v2;v4=v1-=v2;coutv1=;v1.display();/1,2coutv2=;v2.display();/3,4c

4、outv3=;v3.display();/4,6coutv4=;v4.display();/1,2定义一个有理数类Rational,重载算术运算符。写一个完整的程序，测试各种运算符的使用，要求输出化简后的计算结果，注意分母不能为零！测试代码样例：RationalA(2,6),B(1,-2),C;C=-A;C.print();/输出1/3C=A+B;C.print();/输出-1/6C=C*A/B;C.print();C=+A;A.print;C.print();C=B-;B.print;C.print();源程序：#includeclassRationalpublic:Rational(int

5、nn=1,intmm=1);voidprint();voidsimple();Rationaloperator+(Rational&a);/加法friendRationaloperator-(Rational&a,Rational&b);减法friendRationaloperator*(Rational&a,Rational&b);乘法friendRationaloperator/(Rational&a,Rational&b);除法Rationaloperator-。;/取反Rational&operator+();/r=+r1Rationaloperator+(int);/r=r1+Rat

6、ional&operator-();/r=-r1Rationaloperator-(int);/r=r1-operatordouble();friendostream&operator(ostream&output,Rational&a);booloperatorr2boolRational:operator(double)a.n/a.m?true:false;/r1=r2booloperator=(Rational&a,Rational&b)returndouble(a.n)/a.m=(double)b.n/b.m?true:false;/coutr;ostream&operator(ost

7、ream&output,Rational&a)/output(double)a.n/a.mendl;if(a.m0)outputThevalueis-a.n/-a.mendl;elseoutputThevalueisa.n/a.mendl;returnoutput;voidRational:print()simple();if(m0)coutThevalueis-n/-mendl;elsecoutThevalueisn/mendl;voidRational:simple()inta=m,b=n,r=0;if(m#includevstdlib.hstructNodeintval;Node*pNe

8、xt;classIntSetNode*first;/指向链表的头结点public:IntSet()first=0;IntSet(intcount);IntSet(IntSet&old);IntSet();booladd(intnum);增加元素booldel(intnum);删除元素boolsearch(intnum);/查找元素voidshow();IntSetoperator+(IntSet&other);/并IntSetoperator-(IntSet&other);/差IntSetoperator*(IntSet&other);/交IntSet&operator=(IntSet&oth

9、er);/赋值，作为左值需要返回引用类型!IntSetoperator-=(IntSet&other);IntSet:IntSet(IntSet&old)Node*p=old.first，*tail;if(!p)first=0;elseNode*now=newNode;now-val=p-val;first=now;tail=now;p=p-pNext;while(p)Node*now=newNode;now-val=p-val;tail-pNext=now;tail=now;p=p-pNext;tail-pNext=0;IntSet:IntSet(intcount)Node*head=0，*

10、tail=0;coutSetnewLinkwithcountnote!endl;for(inti=0;icount;i+)coutnow-val;if(!head)head=now;elsetail-pNext=now;tail=now;if(count!=0)tail-pNext=0;first=head;IntSet:IntSet()Node*p=first,*pre;while(p)pre=p;p=p-pNext;deletepre;boolIntSet:add(intnum)Node*tail=first;if(first)while(tail)if(tail-val=num)cout

11、Thenumisintheset!pNext;Node*now=newNode;now-val=num;if(!now)coutErrornewnodewhenaddone!pNext)tail=tail-pNext;tail-pNext=now;tail=now;tail-pNext=0;return1;boolIntSet:search(intnum)if(!first)coutEmptyset,deletenonode!val)&p-pNext)p=p-pNext;if(num=(p-val)return1;elsereturn0;boolIntSet:del(intnum)if(!fi

12、rst)coutEmptyset,deletenonode!val)&p-pNext)pre=p;p=p-pNext;if(num=p-val)if(p=first)first=p-pNext;elsepre-pNext=p-pNext;coutDeletenum!endl;return1;elsecoutthenumbertobedeltedisnotintheset!;return0;voidIntSet:show()coutshowallnodeinthelink:endl;inti=0;Node*tail=first;while(tail)i+;couti)valpNext;IntSe

13、tIntSet:operator+(IntSet&other)IntSettemp(other);Node*p=first;while(p)temp.add(p-val);p=p-pNext;returntemp;IntSetIntSet:operator-(IntSet&other)IntSettemp(*this);Node*q=other.first;while(q)if(search(q-val)temp.del(q-val);q=q-pNext;if(!first)coutEmpty!val)del(q-val);q=q-pNext;if(!first)coutEmpty!val)t

14、emp.del(p-val);p=p-pNext;if(!temp.first)coutEmpty!val=p2-val;pre=p1;p1=p1-pNext;p2=p2-pNext;if(p2)/old链表比较长while(p2)add(p2-val);p2=p2-pNext;if(pl)当前链表比较长pre-pNext=0;/删除多余的链表Node*prel;while(pl)prel=pl;pl=pl-pNext;deleteprel;return*this;voidmain()IntSetA;add(3);A.add(5);add(l);coutSetAendl;A.show();A.

15、del(0);coutSetA-endl;A.show();IntSetB;add(5);B.add(4);coutSetBendl;B.show();coutvvSetA+Bvvendl;并(A+B).show();coutvvSetA-Bvvendl;差(A-B).show();coutvvSetA*Bvvendl;交(A*B).show();IntSetC=A;coutvvSetCvvendl;show();A-=B;-=A.show();运彳丁结果：c：FD:CprojectEbcDeljugljc_exebetAshouallnodeinthelink：p51thenumbeptos

16、houallnodebeindeltedisnotintliesetTSetfi-thelink：p51betBshouallnodeinthelink：p4fi+BThenumisintheset!shouallnodeinthelink：p431betfiBDelete5!shouallnodeinthelink：p1fi*BDelete3fDeleteIfshouallnodeinthelinkSetCshouallnodeinthelinkp51inthelinkDelete5fshouallnodetocontinue(4)设计日期类(Date),重载下列运算符实现相关操作:重载一(

17、日期相差天数)(2)重载+(Date+int)(3)重载(intDate)(4)重载+(Dated;d+;+d;+d;)程序源代码#include/usingnamespacestd;classDatepublic:Date(inty,intm,intd);intoperator-(Date&date2);friendDateoperator+(Date&date1,intnum);friendDateoperator+(intnum,Date&date1);Date&operator+();Dateoperator+(int);intdaycount();voidadjust();voids

18、how();private:intyear,month,day;boolisLeapYear(inti)return(i%4=0&i%100!=0)|(i%400=0);voidDate:adjust()intMonth13=0,31,28,31,30,31,30,31,31,30,31,30,31;if(isLeapYear(year)Month2+;if(dayMonthmonth)day-=Monthmonth;month+;if(month=13)month=1;year+;Dateoperator+(Date&date1,intnum)Datetemp(date1);temp.day

19、=date1.day+num;temp.adjust();returntemp;Dateoperator+(intnum,Date&date1)Datetemp(date1);temp.day=date1.day+num;temp.adjust();returntemp;intDate:daycount()intdayOfMonth13=0,31,28,31,30,31,30,31,31,30,31,30,31,i,sum=0;for(i=1;imonth;i+)sum+=dayOfMonthi;sum+=day;if(isLeapYear(year)sum+=1;for(i=1;iyear;

20、i+)if(isLeapYear(i)sum+=366;elsesum+=365;returnsum;intDate:operator-(Date&date2)return(*this).daycount()-date2.daycount();Date:Date(inty,intm,intd)year=y;month=m;day=d;voidDate:show()coutyear/month/dayendl;DateDate:operator+(int)Dateold=*this;day+;adjust。；returnold;Date&Date:operator+()day+;adjust。；

21、return*this;voidmain()Datedl(2011,12,31);Dated2(2010,4,1);coutvv(d1-d2)vvendl;Dated4=d1+5;d4.show();Dated5=10+d2;d5.show();Dated6=d1+;d6.show();Dated7=+d1;d7.show();Dated8=+d1;d8.show();:CprojectsbsvDebug.tsv.exe-6392012/1/5201/4/112011/12/312912/1/22912/1/4PressanyFertccnt.nuc（5）设计字符串类（String）,定义各种

22、构造函数并实现以下运算符重载:（1）重载+（连接）（2）重载=（相等）和v（小于）（3）重载Stringstr1;str1.set(Ilove);Stringstr2(you);Stringstr3=str1+str2;str3.print();Stringstr4=str1+love+;str4.print();if(str3str2)cout”str3str2”endl;elseif(str3=str2)cout”str3=str2”endl;elsecoutstr2”endl;str11=str21;str1.print();str2.print();程序源代码#include#incl

23、ude#includeclassStringpublic:String();String(char*s);String();voidshow();voidset(char*newstr);Stringoperator+(String&str2);friendStringoperator+(String&str1,char*str2);booloperator(String&str2);booloperator=(String&str2);char&operator(inti);private:char*str;intlen;String:String()if(!str)deletestr;St

24、ring:String()len=0;String:String(char*s)len=strlen(s);str=newcharlen+1;if(str!=0)strcpy(str,s);strlen=0;char&String:operator(inti)if(str=0)couterror;exit(0);elseif(i=len)coutoutofrange!;exit(0);elsereturnstri;boolString:operator=(String&str2)if(strcmp(str,str2.str)=0)returntrue;elsereturnfalse;boolString:operator(String&str2)if(strcmp(str,str2.str)0)returntrue;elsereturnfalse;Stringoperator+(String&str1,char*str2)Stringret;ret.len=str1.len+strlen(str2);ret.str=